Tânia Márcia Sacramento Melo

Publications (2)8.22 Total impact

• Source

  Available from: Leandro Vinícius Alves Gurgel

  Article: Adsorption studies of methylene blue and gentian violet on sugarcane bagasse modified with EDTA dianhydride (EDTAD) in aqueous solutions: Kinetic and equilibrium aspects.

  Karla Aparecida Guimarães Gusmão, Leandro Vinícius Alves Gurgel, Tânia Márcia Sacramento Melo, Laurent Frédéric Gil
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  ABSTRACT: In this study the adsorption of cationic dyes by modified sugarcane bagasse with EDTA dianhydride (EB) was examined using methylene blue (MB) and gentian violet (GV) as model compounds in aqueous single solutions. The synthesized adsorbent (EB) was characterized by FTIR, elemental analysis, and BET. The capacity of EB to adsorb dyes was evaluated at different contact times, pH values, and initial dye concentrations. According to the obtained results, the adsorption processes could be described by a pseudo-second-order kinetic model. The adsorption isotherms were well fitted by the Langmuir model. Maximum adsorption capacities for MB and GV on EB were found to be 202.43 and 327.83 mg/g, respectively. The free energy change during adsorption of MB and GV was found to be -22.50 and -24.21 kJ/mol, respectively, suggesting that chemisorption is the main mechanism controlling the adsorption process.
  Journal of Environmental Management 02/2013; 118C:135-143. · 3.24 Impact Factor
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  Available from: Leandro Vinícius Alves Gurgel

  Article: Adsorption of heavy metal ion from aqueous single metal solution by chemically modified sugarcane bagasse.

  Osvaldo Karnitz, Leandro Vinicius Alves Gurgel, Júlio César Perin de Melo, Vagner Roberto Botaro, Tânia Márcia Sacramento Melo, Rossimiriam Pereira de Freitas Gil, Laurent Frédéric Gil
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  ABSTRACT: This work describes the preparation of new chelating materials derived from sugarcane bagasse for adsorption of heavy metal ions in aqueous solution. The first part of this report deals with the chemical modification of sugarcane bagasse with succinic anhydride. The carboxylic acid functions introduced into the material were used to anchor polyamines, which resulted in two yet unpublished modified sugarcane bagasse materials. The obtained materials were characterized by elemental analysis and infrared spectroscopy (IR). The second part of this reports features the comparative evaluation of the adsorption capacity of the modified sugarcane bagasse materials for Cu(2+), Cd(2+), and Pb(2+) ions in aqueous single metal solution by classical titration. Adsorption isotherms were studied by the Freundlich and Langmuir models.
  Bioresource Technology 05/2007; 98(6):1291-7. · 4.98 Impact Factor